The correct answer is Crimson. It has unlimited ammo, never has to reload, and it’s more maneuverable than RD. Zombie’s heads are squishy so 1 burst would take one down easy and refill your mag. I’m not counting the heal as a thing because if a zombie bites you, refilling your health won’t save you. Still turning. You’d probably want an energy hand cannon for your secondary for ammo conservation / lightweight since there just zombies. Something like Trust with outlaw and splosive rounds. Fantastic crowd control and very light and nimble. In real life if things got hairy you could use both guns akimbo style. For heavy, I’d probably rock a sword because that will always be there and never run out of ammo IRL. Quickfang FTW because it also boosts movement speed. I’m operating under the assumption that we are in real life where ammo bricks don’t drop off of zombies and ammo resourcefulness will need to be a big deal.